We found this sophisticated meter circuit in an article in Radio Electronics magazine from June 1959. The article taught how to assemble it. Transistors are common types at the time.
This circuit is from a technical manual of the 80's. The operational ones are of the time like the...
The circuit that we give below has two possible applications: it can be used to control a lamp...
We found this circuit in a 1996 publication. Equivalent components can be tried, especially in the...